[carpenj]

Hey everyone, I found a great deal on a "used" 2024 M240i xDrive in the color I wanted while shopping for a new one so I jumped on it. It came with the Turanza RFTs, which I'm planning to replace with DWS06+. I currently have the 797m wheels in 8" square setup.

What are the pros and cons of going with 8.5" wheels out back and the 225-255 setup over a squared 235/40R19 size? Launch control already doesn't spin the RFTs off the line and when I do a little corner carving, I assume the 235 squared setup would feel a little more neutral. I'm not worried about the cost of the two 8.5" wheels. Am I missing anything? Not sure why BMW didn't put 235s on an 8" wheel to begin with.

[IanH]

Just get 245/35/19, square. (If you want oem sidewall height)

I went 245/40/19 for my winter setup and it's working great so far, doesnt look noticeably lifted.

The reason oem stagger is 225/40/19 and 255/35/19 is to achieve equal rolling diameters. Can't be done with 235.

[carpenj]

Originally Posted by IanH

Just get 245/35/19, square. (If you want oem sidewall height)

I went 245/40/19 for my winter setup and it's working great so far, doesnt look noticeably lifted.

The reason oem stagger is 225/40/19 and 255/35/19 is to achieve equal rolling diameters. Can't be done with 235.

That makes sense, with xDrive needing the same height front and rear. I'm coming from a PP1 Mustang where that wasn't an issue. I've had trouble finding pictures online of 245/35R19 on an 8" wheel - you don't think a 245 will look too wide on the 8" wheel? My winter setup on the Mustang was 245s on an 8.5" and it looked fine.

[IanH]

245 on 8.5 is basically directly vertically aligned, 245 is rated to fit 8in wheel, I don't think it will look bad. (6mm more overhang per side)

The way I think about it, performance fitment is 255 rear, you should get as close to 255 as you can, but still run square which is 245.

[carpenj]

Originally Posted by IanH

245 on 8.5 is basically directly vertically aligned, 245 is rated to fit 8in wheel, I don't think it will look bad. (6mm more overhang per side)

The way I think about it, performance fitment is 255 rear, you should get as close to 255 as you can, but still run square which is 245.

Thanks for the input! I know it's not this simple but total width on the 225/255 is 960mm. 235 square is 940mm, and 245 square is 980mm. The 245 may give me a little more curb rash protection, but a little less pothole protection than a 234/40.

Yes, I generally overthink things...lol

[IanH]

You can run 245/40